Interior-wall finish



Reissued Sept. 22, 1925.

UNITED sr rss PATENT OFFICE.

WALTER IB. ALLEN, OF WORCESTER, MASSACHUSETTS,

assrenoa, BY Muslin Assrom MENTS, TO CRAFTEX COMPANY, 01 BOSTON,MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

INTERIOR-WALL rmrsn.

No Drawing. Original No. 1,477,096, dated December 11, 1923, Serial No.533,667, filed February 2, 1922. Application for reissue filed April 7,1924. Serial No. 704,888.

'To all whomit may concern:

Be it known that I, WALTER B. ALLEN,a citizen ofthe United States,residing at Worcester, in the county ofWorcester and State ofMassachusetts, have invented new and useful Improvements inInterior-Wall Finish, of which the following is a specification. I Theobject of my invention is the produc tion of a paint to be applied tointerior walls of buildings for the purpose of providing an economicalcoating and finish.

A further object of the'inventionis the provision of a paint of thischaracter which shall be water-proof, and non-absorbent of moisture andwhich shall at the sametime present an ornamental and attractiveappearance. a

. My composition consists essentially of a mixture of casein with aproportionally small quantity of a suitable solvent therefor and a largequantity of a neutral nonabsorbent mineral filler such as powdered mica.

- More specifically,my composition may consist of a'mixture of casein, aproportionally small quantity of an alkaline substance such as borax orammonia, and a large quantity of a neutral mineral filler includingmica,

either alone or in combination with clay or other silicious materials.

In preparing the composition, I may make use of the ingredients in aboutthe following proportions, namely, eighteen pounds of casein, threepounds of borax or ammonia as the casein solvent or agent assisting inthe dissolving of the casein by itsneutralization of the aciditythereof, five pounds of hydrated lime, forty-five pounds of powderedmica180200 mesh, thirty-five pounds of china clay and seven pounds ofoxide of zinc. Good results may be obtained, however, when theingredients are varied somewhat in proportions or when only the casein,borax and powdered mica are used, the proportions then being eighteenpounds of casein, three pounds of borax and sixty pounds of powderedmica or other neutral mineral filler.

' These ingredients are mixed with any desired coloring matter and aquantity of warm .coats, but one coat of my composition is generallysufiicient to accomplish the desired result. a

My composition is equally adapted for a finish over wall paper orplastered surfaces in either new or repair work, and it can usually beapplied without any preparation of the surface to which it is to beapplied, and can be used in a single coat, thereby producing a finishequal or superior in quality to ordinary paint, more convenient to useand at less expense. In any such use as a finish or in any other use towhich my compound may be adapted, whether in thinner or thicker form,the scaly or lamellated condition of the mica or other substance of likecharacter, is of great assistance in providing a slight elasticity tothe mass by reason of the large amount of contacting flat surfacesthroughout the mass. This coupled with the somewhat flexible characterofthe binder,

which I preferably choose with that character in mind, I am able toobtain a coating which will withstand the come and go not only of theordinary wall surface, but of 1. A composition for interior wall finish,comprising eighteen pounds of casein, three pounds of alkali, fivepounds of hydrated lime, forty-five pounds of powdered -inica,-

180+200 mesh,-thirty five pounds of china clay, and seven pounds ofoxide of zinc.

2. A composition of matter, comprising casein, a solvent therefor, andmica in such proportions as to form a spreadable coating material by theaddition of water.

3. A composition for a wall finish including casein, analkali, and mica,the pro rtion of mica being at least double that o the casein.

4. A composition for a wall finish, com- 5 prislng casein, an alkali,powdered mica,

clay, and oxide of zinc.

5. The process of producing a spreadable coating for finishing surfaces,which .con-

slsts in providing a mixture of casein, a solvent therefor, and mica,and In addm sufiicient water thereto to form a, fluid of esiredconsistency.

' WALTER B. ALLEN

